Clipper engine stalls at idle

Sounds like a fuel tank ventilation system issue. I had similar symptoms on my old Opel Astra, also after quite a few kilometers, and it turned out to be a leak in the system. Have you checked the pressure sensor or any of the air flow?

A leak? Where exactly should I be looking? And how would that cause the stalling? I'm not really sure what a pressure sensor does in this context.

With me, it was the activated charcoal filter that was defective, causing a system failure. The leak messes with the air/fuel mixture, and the purge valve can't compensate. Honestly, leak detection can be tricky; you might be best off having a workshop take a look.

Okay, thanks for the info. I took it to a shop, and you were right – it was the charcoal filter. Repair cost me 275€. Replacing it fixed the stalling and the check engine light is gone. Thanks again!